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responsiveFontSizes.js
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Sun, Jan 26, 22:07

responsiveFontSizes.js
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import _extends from "@babel/runtime/helpers/esm/extends";
import { formatMuiErrorMessage as _formatMuiErrorMessage } from "@mui/utils";
import { isUnitless, convertLength, responsiveProperty, alignProperty, fontGrid } from './cssUtils';
export default function responsiveFontSizes(themeInput, options = {}) {
const {
breakpoints = ['sm', 'md', 'lg'],
disableAlign = false,
factor = 2,
variants = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'subtitle1', 'subtitle2', 'body1', 'body2', 'caption', 'button', 'overline']
} = options;
const theme = _extends({}, themeInput);
theme.typography = _extends({}, theme.typography);
const typography = theme.typography;
// Convert between CSS lengths e.g. em->px or px->rem
// Set the baseFontSize for your project. Defaults to 16px (also the browser default).
const convert = convertLength(typography.htmlFontSize);
const breakpointValues = breakpoints.map(x => theme.breakpoints.values[x]);
variants.forEach(variant => {
const style = typography[variant];
const remFontSize = parseFloat(convert(style.fontSize, 'rem'));
if (remFontSize <= 1) {
return;
}
const maxFontSize = remFontSize;
const minFontSize = 1 + (maxFontSize - 1) / factor;
let {
lineHeight
} = style;
if (!isUnitless(lineHeight) && !disableAlign) {
throw new Error(process.env.NODE_ENV !== "production" ? `MUI: Unsupported non-unitless line height with grid alignment.
Use unitless line heights instead.` : _formatMuiErrorMessage(6));
}
if (!isUnitless(lineHeight)) {
// make it unitless
lineHeight = parseFloat(convert(lineHeight, 'rem')) / parseFloat(remFontSize);
}
let transform = null;
if (!disableAlign) {
transform = value => alignProperty({
size: value,
grid: fontGrid({
pixels: 4,
lineHeight,
htmlFontSize: typography.htmlFontSize
})
});
}
typography[variant] = _extends({}, style, responsiveProperty({
cssProperty: 'fontSize',
min: minFontSize,
max: maxFontSize,
unit: 'rem',
breakpoints: breakpointValues,
transform
}));
});
return theme;
}

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